861 lines
26 KiB
Diff
861 lines
26 KiB
Diff
From e75beb7c2e05550b2846e31ad8a0082c188504da Mon Sep 17 00:00:00 2001
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From: Nick Terrell <terrelln@fb.com>
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Date: Wed, 21 Jun 2017 17:27:42 -0700
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Subject: [PATCH 1/4] lib: Add xxhash module
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Adds xxhash kernel module with xxh32 and xxh64 hashes. xxhash is an
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extremely fast non-cryptographic hash algorithm for checksumming.
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The zstd compression and decompression modules added in the next patch
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require xxhash. I extracted it out from zstd since it is useful on its
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own. I copied the code from the upstream XXHash source repository and
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translated it into kernel style. I ran benchmarks and tests in the kernel
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and tests in userland.
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I benchmarked xxhash as a special character device. I ran in four modes,
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no-op, xxh32, xxh64, and crc32. The no-op mode simply copies the data to
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kernel space and ignores it. The xxh32, xxh64, and crc32 modes compute
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hashes on the copied data. I also ran it with four different buffer sizes.
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The benchmark file is located in the upstream zstd source repository under
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`contrib/linux-kernel/xxhash_test.c` [1].
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I ran the benchmarks on a Ubuntu 14.04 VM with 2 cores and 4 GiB of RAM.
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The VM is running on a MacBook Pro with a 3.1 GHz Intel Core i7 processor,
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16 GB of RAM, and a SSD. I benchmarked using the file `filesystem.squashfs`
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from `ubuntu-16.10-desktop-amd64.iso`, which is 1,536,217,088 B large.
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Run the following commands for the benchmark:
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modprobe xxhash_test
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mknod xxhash_test c 245 0
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time cp filesystem.squashfs xxhash_test
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The time is reported by the time of the userland `cp`.
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The GB/s is computed with
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1,536,217,008 B / time(buffer size, hash)
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which includes the time to copy from userland.
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The Normalized GB/s is computed with
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1,536,217,088 B / (time(buffer size, hash) - time(buffer size, none)).
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| Buffer Size (B) | Hash | Time (s) | GB/s | Adjusted GB/s |
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|-----------------|-------|----------|------|---------------|
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| 1024 | none | 0.408 | 3.77 | - |
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| 1024 | xxh32 | 0.649 | 2.37 | 6.37 |
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| 1024 | xxh64 | 0.542 | 2.83 | 11.46 |
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| 1024 | crc32 | 1.290 | 1.19 | 1.74 |
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| 4096 | none | 0.380 | 4.04 | - |
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| 4096 | xxh32 | 0.645 | 2.38 | 5.79 |
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| 4096 | xxh64 | 0.500 | 3.07 | 12.80 |
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| 4096 | crc32 | 1.168 | 1.32 | 1.95 |
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| 8192 | none | 0.351 | 4.38 | - |
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| 8192 | xxh32 | 0.614 | 2.50 | 5.84 |
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| 8192 | xxh64 | 0.464 | 3.31 | 13.60 |
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| 8192 | crc32 | 1.163 | 1.32 | 1.89 |
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| 16384 | none | 0.346 | 4.43 | - |
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| 16384 | xxh32 | 0.590 | 2.60 | 6.30 |
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| 16384 | xxh64 | 0.466 | 3.30 | 12.80 |
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| 16384 | crc32 | 1.183 | 1.30 | 1.84 |
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Tested in userland using the test-suite in the zstd repo under
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`contrib/linux-kernel/test/XXHashUserlandTest.cpp` [2] by mocking the
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kernel functions. A line in each branch of every function in `xxhash.c`
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was commented out to ensure that the test-suite fails. Additionally
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tested while testing zstd and with SMHasher [3].
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[1] https://phabricator.intern.facebook.com/P57526246
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[2] https://github.com/facebook/zstd/blob/dev/contrib/linux-kernel/test/XXHashUserlandTest.cpp
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[3] https://github.com/aappleby/smhasher
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zstd source repository: https://github.com/facebook/zstd
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XXHash source repository: https://github.com/cyan4973/xxhash
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Signed-off-by: Nick Terrell <terrelln@fb.com>
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---
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include/linux/xxhash.h | 236 +++++++++++++++++++++++
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lib/Kconfig | 3 +
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lib/Makefile | 1 +
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lib/xxhash.c | 500 +++++++++++++++++++++++++++++++++++++++++++++++++
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4 files changed, 740 insertions(+)
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create mode 100644 include/linux/xxhash.h
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create mode 100644 lib/xxhash.c
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diff --git a/include/linux/xxhash.h b/include/linux/xxhash.h
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new file mode 100644
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index 0000000..9e1f42c
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--- /dev/null
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+++ b/include/linux/xxhash.h
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@@ -0,0 +1,236 @@
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+/*
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+ * xxHash - Extremely Fast Hash algorithm
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+ * Copyright (C) 2012-2016, Yann Collet.
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+ *
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+ * BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php)
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+ *
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+ * Redistribution and use in source and binary forms, with or without
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+ * modification, are permitted provided that the following conditions are
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+ * met:
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+ *
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+ * * Redistributions of source code must retain the above copyright
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+ * notice, this list of conditions and the following disclaimer.
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+ * * Redistributions in binary form must reproduce the above
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+ * copyright notice, this list of conditions and the following disclaimer
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+ * in the documentation and/or other materials provided with the
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+ * distribution.
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+ *
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+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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+ *
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+ * This program is free software; you can redistribute it and/or modify it under
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+ * the terms of the GNU General Public License version 2 as published by the
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+ * Free Software Foundation. This program is dual-licensed; you may select
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+ * either version 2 of the GNU General Public License ("GPL") or BSD license
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+ * ("BSD").
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+ *
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+ * You can contact the author at:
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+ * - xxHash homepage: http://cyan4973.github.io/xxHash/
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+ * - xxHash source repository: https://github.com/Cyan4973/xxHash
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+ */
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+
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+/*
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+ * Notice extracted from xxHash homepage:
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+ *
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+ * xxHash is an extremely fast Hash algorithm, running at RAM speed limits.
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+ * It also successfully passes all tests from the SMHasher suite.
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+ *
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+ * Comparison (single thread, Windows Seven 32 bits, using SMHasher on a Core 2
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+ * Duo @3GHz)
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+ *
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+ * Name Speed Q.Score Author
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+ * xxHash 5.4 GB/s 10
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+ * CrapWow 3.2 GB/s 2 Andrew
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+ * MumurHash 3a 2.7 GB/s 10 Austin Appleby
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+ * SpookyHash 2.0 GB/s 10 Bob Jenkins
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+ * SBox 1.4 GB/s 9 Bret Mulvey
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+ * Lookup3 1.2 GB/s 9 Bob Jenkins
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+ * SuperFastHash 1.2 GB/s 1 Paul Hsieh
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+ * CityHash64 1.05 GB/s 10 Pike & Alakuijala
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+ * FNV 0.55 GB/s 5 Fowler, Noll, Vo
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+ * CRC32 0.43 GB/s 9
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+ * MD5-32 0.33 GB/s 10 Ronald L. Rivest
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+ * SHA1-32 0.28 GB/s 10
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+ *
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+ * Q.Score is a measure of quality of the hash function.
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+ * It depends on successfully passing SMHasher test set.
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+ * 10 is a perfect score.
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+ *
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+ * A 64-bits version, named xxh64 offers much better speed,
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+ * but for 64-bits applications only.
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+ * Name Speed on 64 bits Speed on 32 bits
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+ * xxh64 13.8 GB/s 1.9 GB/s
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+ * xxh32 6.8 GB/s 6.0 GB/s
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+ */
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+
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+#ifndef XXHASH_H
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+#define XXHASH_H
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+
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+#include <linux/types.h>
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+
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+/*-****************************
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+ * Simple Hash Functions
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+ *****************************/
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+
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+/**
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+ * xxh32() - calculate the 32-bit hash of the input with a given seed.
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+ *
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+ * @input: The data to hash.
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+ * @length: The length of the data to hash.
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+ * @seed: The seed can be used to alter the result predictably.
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+ *
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+ * Speed on Core 2 Duo @ 3 GHz (single thread, SMHasher benchmark) : 5.4 GB/s
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+ *
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+ * Return: The 32-bit hash of the data.
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+ */
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+uint32_t xxh32(const void *input, size_t length, uint32_t seed);
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+
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+/**
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+ * xxh64() - calculate the 64-bit hash of the input with a given seed.
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+ *
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+ * @input: The data to hash.
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+ * @length: The length of the data to hash.
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+ * @seed: The seed can be used to alter the result predictably.
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+ *
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+ * This function runs 2x faster on 64-bit systems, but slower on 32-bit systems.
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+ *
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+ * Return: The 64-bit hash of the data.
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+ */
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+uint64_t xxh64(const void *input, size_t length, uint64_t seed);
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+
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+/*-****************************
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+ * Streaming Hash Functions
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+ *****************************/
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+
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+/*
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+ * These definitions are only meant to allow allocation of XXH state
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+ * statically, on stack, or in a struct for example.
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+ * Do not use members directly.
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+ */
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+
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+/**
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+ * struct xxh32_state - private xxh32 state, do not use members directly
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+ */
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+struct xxh32_state {
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+ uint32_t total_len_32;
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+ uint32_t large_len;
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+ uint32_t v1;
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+ uint32_t v2;
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+ uint32_t v3;
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+ uint32_t v4;
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+ uint32_t mem32[4];
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+ uint32_t memsize;
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+};
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+
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+/**
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+ * struct xxh32_state - private xxh64 state, do not use members directly
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+ */
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+struct xxh64_state {
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+ uint64_t total_len;
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+ uint64_t v1;
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+ uint64_t v2;
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+ uint64_t v3;
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+ uint64_t v4;
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+ uint64_t mem64[4];
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+ uint32_t memsize;
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+};
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+
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+/**
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+ * xxh32_reset() - reset the xxh32 state to start a new hashing operation
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+ *
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+ * @state: The xxh32 state to reset.
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+ * @seed: Initialize the hash state with this seed.
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+ *
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+ * Call this function on any xxh32_state to prepare for a new hashing operation.
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+ */
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+void xxh32_reset(struct xxh32_state *state, uint32_t seed);
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+
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+/**
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+ * xxh32_update() - hash the data given and update the xxh32 state
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+ *
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+ * @state: The xxh32 state to update.
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+ * @input: The data to hash.
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+ * @length: The length of the data to hash.
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+ *
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+ * After calling xxh32_reset() call xxh32_update() as many times as necessary.
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+ *
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+ * Return: Zero on success, otherwise an error code.
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+ */
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+int xxh32_update(struct xxh32_state *state, const void *input, size_t length);
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+
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+/**
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+ * xxh32_digest() - produce the current xxh32 hash
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+ *
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+ * @state: Produce the current xxh32 hash of this state.
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+ *
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+ * A hash value can be produced at any time. It is still possible to continue
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+ * inserting input into the hash state after a call to xxh32_digest(), and
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+ * generate new hashes later on, by calling xxh32_digest() again.
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+ *
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+ * Return: The xxh32 hash stored in the state.
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+ */
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+uint32_t xxh32_digest(const struct xxh32_state *state);
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+
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+/**
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+ * xxh64_reset() - reset the xxh64 state to start a new hashing operation
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+ *
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+ * @state: The xxh64 state to reset.
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+ * @seed: Initialize the hash state with this seed.
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+ */
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+void xxh64_reset(struct xxh64_state *state, uint64_t seed);
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+
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+/**
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+ * xxh64_update() - hash the data given and update the xxh64 state
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+ * @state: The xxh64 state to update.
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+ * @input: The data to hash.
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+ * @length: The length of the data to hash.
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+ *
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+ * After calling xxh64_reset() call xxh64_update() as many times as necessary.
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+ *
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+ * Return: Zero on success, otherwise an error code.
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+ */
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+int xxh64_update(struct xxh64_state *state, const void *input, size_t length);
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+
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+/**
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+ * xxh64_digest() - produce the current xxh64 hash
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+ *
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+ * @state: Produce the current xxh64 hash of this state.
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+ *
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+ * A hash value can be produced at any time. It is still possible to continue
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+ * inserting input into the hash state after a call to xxh64_digest(), and
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+ * generate new hashes later on, by calling xxh64_digest() again.
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+ *
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+ * Return: The xxh64 hash stored in the state.
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+ */
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+uint64_t xxh64_digest(const struct xxh64_state *state);
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+
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+/*-**************************
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+ * Utils
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+ ***************************/
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+
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+/**
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+ * xxh32_copy_state() - copy the source state into the destination state
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+ *
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+ * @src: The source xxh32 state.
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+ * @dst: The destination xxh32 state.
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+ */
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+void xxh32_copy_state(struct xxh32_state *dst, const struct xxh32_state *src);
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+
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+/**
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+ * xxh64_copy_state() - copy the source state into the destination state
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+ *
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+ * @src: The source xxh64 state.
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+ * @dst: The destination xxh64 state.
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+ */
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+void xxh64_copy_state(struct xxh64_state *dst, const struct xxh64_state *src);
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+
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+#endif /* XXHASH_H */
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diff --git a/lib/Kconfig b/lib/Kconfig
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index 0c8b78a..b6009d7 100644
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--- a/lib/Kconfig
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+++ b/lib/Kconfig
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@@ -184,6 +184,9 @@ config CRC8
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when they need to do cyclic redundancy check according CRC8
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algorithm. Module will be called crc8.
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+config XXHASH
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+ tristate
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+
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config AUDIT_GENERIC
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bool
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depends on AUDIT && !AUDIT_ARCH
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diff --git a/lib/Makefile b/lib/Makefile
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index 0166fbc..1338226 100644
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--- a/lib/Makefile
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+++ b/lib/Makefile
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@@ -102,6 +102,7 @@ obj-$(CONFIG_CRC32_SELFTEST) += crc32test.o
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obj-$(CONFIG_CRC7) += crc7.o
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obj-$(CONFIG_LIBCRC32C) += libcrc32c.o
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obj-$(CONFIG_CRC8) += crc8.o
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+obj-$(CONFIG_XXHASH) += xxhash.o
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obj-$(CONFIG_GENERIC_ALLOCATOR) += genalloc.o
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obj-$(CONFIG_842_COMPRESS) += 842/
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diff --git a/lib/xxhash.c b/lib/xxhash.c
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new file mode 100644
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index 0000000..dc94904
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--- /dev/null
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+++ b/lib/xxhash.c
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@@ -0,0 +1,500 @@
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+/*
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+ * xxHash - Extremely Fast Hash algorithm
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+ * Copyright (C) 2012-2016, Yann Collet.
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+ *
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+ * BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php)
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+ *
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+ * Redistribution and use in source and binary forms, with or without
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+ * modification, are permitted provided that the following conditions are
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+ * met:
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+ *
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+ * * Redistributions of source code must retain the above copyright
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+ * notice, this list of conditions and the following disclaimer.
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+ * * Redistributions in binary form must reproduce the above
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+ * copyright notice, this list of conditions and the following disclaimer
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+ * in the documentation and/or other materials provided with the
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+ * distribution.
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+ *
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+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
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+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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+ *
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+ * This program is free software; you can redistribute it and/or modify it under
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+ * the terms of the GNU General Public License version 2 as published by the
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+ * Free Software Foundation. This program is dual-licensed; you may select
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+ * either version 2 of the GNU General Public License ("GPL") or BSD license
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+ * ("BSD").
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+ *
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+ * You can contact the author at:
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+ * - xxHash homepage: http://cyan4973.github.io/xxHash/
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+ * - xxHash source repository: https://github.com/Cyan4973/xxHash
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+ */
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+
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+#include <asm/unaligned.h>
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+#include <linux/errno.h>
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+#include <linux/compiler.h>
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+#include <linux/kernel.h>
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+#include <linux/module.h>
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+#include <linux/string.h>
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+#include <linux/xxhash.h>
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+
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+/*-*************************************
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+ * Macros
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+ **************************************/
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+#define xxh_rotl32(x, r) ((x << r) | (x >> (32 - r)))
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+#define xxh_rotl64(x, r) ((x << r) | (x >> (64 - r)))
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+
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+#ifdef __LITTLE_ENDIAN
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+# define XXH_CPU_LITTLE_ENDIAN 1
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+#else
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+# define XXH_CPU_LITTLE_ENDIAN 0
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+#endif
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+
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+/*-*************************************
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+ * Constants
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+ **************************************/
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+static const uint32_t PRIME32_1 = 2654435761U;
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+static const uint32_t PRIME32_2 = 2246822519U;
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+static const uint32_t PRIME32_3 = 3266489917U;
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+static const uint32_t PRIME32_4 = 668265263U;
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+static const uint32_t PRIME32_5 = 374761393U;
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+
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+static const uint64_t PRIME64_1 = 11400714785074694791ULL;
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+static const uint64_t PRIME64_2 = 14029467366897019727ULL;
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+static const uint64_t PRIME64_3 = 1609587929392839161ULL;
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+static const uint64_t PRIME64_4 = 9650029242287828579ULL;
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+static const uint64_t PRIME64_5 = 2870177450012600261ULL;
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+
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+/*-**************************
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+ * Utils
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+ ***************************/
|
|
+void xxh32_copy_state(struct xxh32_state *dst, const struct xxh32_state *src)
|
|
+{
|
|
+ memcpy(dst, src, sizeof(*dst));
|
|
+}
|
|
+EXPORT_SYMBOL(xxh32_copy_state);
|
|
+
|
|
+void xxh64_copy_state(struct xxh64_state *dst, const struct xxh64_state *src)
|
|
+{
|
|
+ memcpy(dst, src, sizeof(*dst));
|
|
+}
|
|
+EXPORT_SYMBOL(xxh64_copy_state);
|
|
+
|
|
+/*-***************************
|
|
+ * Simple Hash Functions
|
|
+ ****************************/
|
|
+static uint32_t xxh32_round(uint32_t seed, const uint32_t input)
|
|
+{
|
|
+ seed += input * PRIME32_2;
|
|
+ seed = xxh_rotl32(seed, 13);
|
|
+ seed *= PRIME32_1;
|
|
+ return seed;
|
|
+}
|
|
+
|
|
+uint32_t xxh32(const void *input, const size_t len, const uint32_t seed)
|
|
+{
|
|
+ const uint8_t *p = (const uint8_t *)input;
|
|
+ const uint8_t *b_end = p + len;
|
|
+ uint32_t h32;
|
|
+
|
|
+ if (len >= 16) {
|
|
+ const uint8_t *const limit = b_end - 16;
|
|
+ uint32_t v1 = seed + PRIME32_1 + PRIME32_2;
|
|
+ uint32_t v2 = seed + PRIME32_2;
|
|
+ uint32_t v3 = seed + 0;
|
|
+ uint32_t v4 = seed - PRIME32_1;
|
|
+
|
|
+ do {
|
|
+ v1 = xxh32_round(v1, get_unaligned_le32(p));
|
|
+ p += 4;
|
|
+ v2 = xxh32_round(v2, get_unaligned_le32(p));
|
|
+ p += 4;
|
|
+ v3 = xxh32_round(v3, get_unaligned_le32(p));
|
|
+ p += 4;
|
|
+ v4 = xxh32_round(v4, get_unaligned_le32(p));
|
|
+ p += 4;
|
|
+ } while (p <= limit);
|
|
+
|
|
+ h32 = xxh_rotl32(v1, 1) + xxh_rotl32(v2, 7) +
|
|
+ xxh_rotl32(v3, 12) + xxh_rotl32(v4, 18);
|
|
+ } else {
|
|
+ h32 = seed + PRIME32_5;
|
|
+ }
|
|
+
|
|
+ h32 += (uint32_t)len;
|
|
+
|
|
+ while (p + 4 <= b_end) {
|
|
+ h32 += get_unaligned_le32(p) * PRIME32_3;
|
|
+ h32 = xxh_rotl32(h32, 17) * PRIME32_4;
|
|
+ p += 4;
|
|
+ }
|
|
+
|
|
+ while (p < b_end) {
|
|
+ h32 += (*p) * PRIME32_5;
|
|
+ h32 = xxh_rotl32(h32, 11) * PRIME32_1;
|
|
+ p++;
|
|
+ }
|
|
+
|
|
+ h32 ^= h32 >> 15;
|
|
+ h32 *= PRIME32_2;
|
|
+ h32 ^= h32 >> 13;
|
|
+ h32 *= PRIME32_3;
|
|
+ h32 ^= h32 >> 16;
|
|
+
|
|
+ return h32;
|
|
+}
|
|
+EXPORT_SYMBOL(xxh32);
|
|
+
|
|
+static uint64_t xxh64_round(uint64_t acc, const uint64_t input)
|
|
+{
|
|
+ acc += input * PRIME64_2;
|
|
+ acc = xxh_rotl64(acc, 31);
|
|
+ acc *= PRIME64_1;
|
|
+ return acc;
|
|
+}
|
|
+
|
|
+static uint64_t xxh64_merge_round(uint64_t acc, uint64_t val)
|
|
+{
|
|
+ val = xxh64_round(0, val);
|
|
+ acc ^= val;
|
|
+ acc = acc * PRIME64_1 + PRIME64_4;
|
|
+ return acc;
|
|
+}
|
|
+
|
|
+uint64_t xxh64(const void *input, const size_t len, const uint64_t seed)
|
|
+{
|
|
+ const uint8_t *p = (const uint8_t *)input;
|
|
+ const uint8_t *const b_end = p + len;
|
|
+ uint64_t h64;
|
|
+
|
|
+ if (len >= 32) {
|
|
+ const uint8_t *const limit = b_end - 32;
|
|
+ uint64_t v1 = seed + PRIME64_1 + PRIME64_2;
|
|
+ uint64_t v2 = seed + PRIME64_2;
|
|
+ uint64_t v3 = seed + 0;
|
|
+ uint64_t v4 = seed - PRIME64_1;
|
|
+
|
|
+ do {
|
|
+ v1 = xxh64_round(v1, get_unaligned_le64(p));
|
|
+ p += 8;
|
|
+ v2 = xxh64_round(v2, get_unaligned_le64(p));
|
|
+ p += 8;
|
|
+ v3 = xxh64_round(v3, get_unaligned_le64(p));
|
|
+ p += 8;
|
|
+ v4 = xxh64_round(v4, get_unaligned_le64(p));
|
|
+ p += 8;
|
|
+ } while (p <= limit);
|
|
+
|
|
+ h64 = xxh_rotl64(v1, 1) + xxh_rotl64(v2, 7) +
|
|
+ xxh_rotl64(v3, 12) + xxh_rotl64(v4, 18);
|
|
+ h64 = xxh64_merge_round(h64, v1);
|
|
+ h64 = xxh64_merge_round(h64, v2);
|
|
+ h64 = xxh64_merge_round(h64, v3);
|
|
+ h64 = xxh64_merge_round(h64, v4);
|
|
+
|
|
+ } else {
|
|
+ h64 = seed + PRIME64_5;
|
|
+ }
|
|
+
|
|
+ h64 += (uint64_t)len;
|
|
+
|
|
+ while (p + 8 <= b_end) {
|
|
+ const uint64_t k1 = xxh64_round(0, get_unaligned_le64(p));
|
|
+
|
|
+ h64 ^= k1;
|
|
+ h64 = xxh_rotl64(h64, 27) * PRIME64_1 + PRIME64_4;
|
|
+ p += 8;
|
|
+ }
|
|
+
|
|
+ if (p + 4 <= b_end) {
|
|
+ h64 ^= (uint64_t)(get_unaligned_le32(p)) * PRIME64_1;
|
|
+ h64 = xxh_rotl64(h64, 23) * PRIME64_2 + PRIME64_3;
|
|
+ p += 4;
|
|
+ }
|
|
+
|
|
+ while (p < b_end) {
|
|
+ h64 ^= (*p) * PRIME64_5;
|
|
+ h64 = xxh_rotl64(h64, 11) * PRIME64_1;
|
|
+ p++;
|
|
+ }
|
|
+
|
|
+ h64 ^= h64 >> 33;
|
|
+ h64 *= PRIME64_2;
|
|
+ h64 ^= h64 >> 29;
|
|
+ h64 *= PRIME64_3;
|
|
+ h64 ^= h64 >> 32;
|
|
+
|
|
+ return h64;
|
|
+}
|
|
+EXPORT_SYMBOL(xxh64);
|
|
+
|
|
+/*-**************************************************
|
|
+ * Advanced Hash Functions
|
|
+ ***************************************************/
|
|
+void xxh32_reset(struct xxh32_state *statePtr, const uint32_t seed)
|
|
+{
|
|
+ /* use a local state for memcpy() to avoid strict-aliasing warnings */
|
|
+ struct xxh32_state state;
|
|
+
|
|
+ memset(&state, 0, sizeof(state));
|
|
+ state.v1 = seed + PRIME32_1 + PRIME32_2;
|
|
+ state.v2 = seed + PRIME32_2;
|
|
+ state.v3 = seed + 0;
|
|
+ state.v4 = seed - PRIME32_1;
|
|
+ memcpy(statePtr, &state, sizeof(state));
|
|
+}
|
|
+EXPORT_SYMBOL(xxh32_reset);
|
|
+
|
|
+void xxh64_reset(struct xxh64_state *statePtr, const uint64_t seed)
|
|
+{
|
|
+ /* use a local state for memcpy() to avoid strict-aliasing warnings */
|
|
+ struct xxh64_state state;
|
|
+
|
|
+ memset(&state, 0, sizeof(state));
|
|
+ state.v1 = seed + PRIME64_1 + PRIME64_2;
|
|
+ state.v2 = seed + PRIME64_2;
|
|
+ state.v3 = seed + 0;
|
|
+ state.v4 = seed - PRIME64_1;
|
|
+ memcpy(statePtr, &state, sizeof(state));
|
|
+}
|
|
+EXPORT_SYMBOL(xxh64_reset);
|
|
+
|
|
+int xxh32_update(struct xxh32_state *state, const void *input, const size_t len)
|
|
+{
|
|
+ const uint8_t *p = (const uint8_t *)input;
|
|
+ const uint8_t *const b_end = p + len;
|
|
+
|
|
+ if (input == NULL)
|
|
+ return -EINVAL;
|
|
+
|
|
+ state->total_len_32 += (uint32_t)len;
|
|
+ state->large_len |= (len >= 16) | (state->total_len_32 >= 16);
|
|
+
|
|
+ if (state->memsize + len < 16) { /* fill in tmp buffer */
|
|
+ memcpy((uint8_t *)(state->mem32) + state->memsize, input, len);
|
|
+ state->memsize += (uint32_t)len;
|
|
+ return 0;
|
|
+ }
|
|
+
|
|
+ if (state->memsize) { /* some data left from previous update */
|
|
+ const uint32_t *p32 = state->mem32;
|
|
+
|
|
+ memcpy((uint8_t *)(state->mem32) + state->memsize, input,
|
|
+ 16 - state->memsize);
|
|
+
|
|
+ state->v1 = xxh32_round(state->v1, get_unaligned_le32(p32));
|
|
+ p32++;
|
|
+ state->v2 = xxh32_round(state->v2, get_unaligned_le32(p32));
|
|
+ p32++;
|
|
+ state->v3 = xxh32_round(state->v3, get_unaligned_le32(p32));
|
|
+ p32++;
|
|
+ state->v4 = xxh32_round(state->v4, get_unaligned_le32(p32));
|
|
+ p32++;
|
|
+
|
|
+ p += 16-state->memsize;
|
|
+ state->memsize = 0;
|
|
+ }
|
|
+
|
|
+ if (p <= b_end - 16) {
|
|
+ const uint8_t *const limit = b_end - 16;
|
|
+ uint32_t v1 = state->v1;
|
|
+ uint32_t v2 = state->v2;
|
|
+ uint32_t v3 = state->v3;
|
|
+ uint32_t v4 = state->v4;
|
|
+
|
|
+ do {
|
|
+ v1 = xxh32_round(v1, get_unaligned_le32(p));
|
|
+ p += 4;
|
|
+ v2 = xxh32_round(v2, get_unaligned_le32(p));
|
|
+ p += 4;
|
|
+ v3 = xxh32_round(v3, get_unaligned_le32(p));
|
|
+ p += 4;
|
|
+ v4 = xxh32_round(v4, get_unaligned_le32(p));
|
|
+ p += 4;
|
|
+ } while (p <= limit);
|
|
+
|
|
+ state->v1 = v1;
|
|
+ state->v2 = v2;
|
|
+ state->v3 = v3;
|
|
+ state->v4 = v4;
|
|
+ }
|
|
+
|
|
+ if (p < b_end) {
|
|
+ memcpy(state->mem32, p, (size_t)(b_end-p));
|
|
+ state->memsize = (uint32_t)(b_end-p);
|
|
+ }
|
|
+
|
|
+ return 0;
|
|
+}
|
|
+EXPORT_SYMBOL(xxh32_update);
|
|
+
|
|
+uint32_t xxh32_digest(const struct xxh32_state *state)
|
|
+{
|
|
+ const uint8_t *p = (const uint8_t *)state->mem32;
|
|
+ const uint8_t *const b_end = (const uint8_t *)(state->mem32) +
|
|
+ state->memsize;
|
|
+ uint32_t h32;
|
|
+
|
|
+ if (state->large_len) {
|
|
+ h32 = xxh_rotl32(state->v1, 1) + xxh_rotl32(state->v2, 7) +
|
|
+ xxh_rotl32(state->v3, 12) + xxh_rotl32(state->v4, 18);
|
|
+ } else {
|
|
+ h32 = state->v3 /* == seed */ + PRIME32_5;
|
|
+ }
|
|
+
|
|
+ h32 += state->total_len_32;
|
|
+
|
|
+ while (p + 4 <= b_end) {
|
|
+ h32 += get_unaligned_le32(p) * PRIME32_3;
|
|
+ h32 = xxh_rotl32(h32, 17) * PRIME32_4;
|
|
+ p += 4;
|
|
+ }
|
|
+
|
|
+ while (p < b_end) {
|
|
+ h32 += (*p) * PRIME32_5;
|
|
+ h32 = xxh_rotl32(h32, 11) * PRIME32_1;
|
|
+ p++;
|
|
+ }
|
|
+
|
|
+ h32 ^= h32 >> 15;
|
|
+ h32 *= PRIME32_2;
|
|
+ h32 ^= h32 >> 13;
|
|
+ h32 *= PRIME32_3;
|
|
+ h32 ^= h32 >> 16;
|
|
+
|
|
+ return h32;
|
|
+}
|
|
+EXPORT_SYMBOL(xxh32_digest);
|
|
+
|
|
+int xxh64_update(struct xxh64_state *state, const void *input, const size_t len)
|
|
+{
|
|
+ const uint8_t *p = (const uint8_t *)input;
|
|
+ const uint8_t *const b_end = p + len;
|
|
+
|
|
+ if (input == NULL)
|
|
+ return -EINVAL;
|
|
+
|
|
+ state->total_len += len;
|
|
+
|
|
+ if (state->memsize + len < 32) { /* fill in tmp buffer */
|
|
+ memcpy(((uint8_t *)state->mem64) + state->memsize, input, len);
|
|
+ state->memsize += (uint32_t)len;
|
|
+ return 0;
|
|
+ }
|
|
+
|
|
+ if (state->memsize) { /* tmp buffer is full */
|
|
+ const uint64_t *p64 = state->mem64;
|
|
+
|
|
+ memcpy(((uint8_t *)p64) + state->memsize, input,
|
|
+ 32 - state->memsize);
|
|
+
|
|
+ state->v1 = xxh64_round(state->v1, get_unaligned_le64(p64));
|
|
+ p64++;
|
|
+ state->v2 = xxh64_round(state->v2, get_unaligned_le64(p64));
|
|
+ p64++;
|
|
+ state->v3 = xxh64_round(state->v3, get_unaligned_le64(p64));
|
|
+ p64++;
|
|
+ state->v4 = xxh64_round(state->v4, get_unaligned_le64(p64));
|
|
+
|
|
+ p += 32 - state->memsize;
|
|
+ state->memsize = 0;
|
|
+ }
|
|
+
|
|
+ if (p + 32 <= b_end) {
|
|
+ const uint8_t *const limit = b_end - 32;
|
|
+ uint64_t v1 = state->v1;
|
|
+ uint64_t v2 = state->v2;
|
|
+ uint64_t v3 = state->v3;
|
|
+ uint64_t v4 = state->v4;
|
|
+
|
|
+ do {
|
|
+ v1 = xxh64_round(v1, get_unaligned_le64(p));
|
|
+ p += 8;
|
|
+ v2 = xxh64_round(v2, get_unaligned_le64(p));
|
|
+ p += 8;
|
|
+ v3 = xxh64_round(v3, get_unaligned_le64(p));
|
|
+ p += 8;
|
|
+ v4 = xxh64_round(v4, get_unaligned_le64(p));
|
|
+ p += 8;
|
|
+ } while (p <= limit);
|
|
+
|
|
+ state->v1 = v1;
|
|
+ state->v2 = v2;
|
|
+ state->v3 = v3;
|
|
+ state->v4 = v4;
|
|
+ }
|
|
+
|
|
+ if (p < b_end) {
|
|
+ memcpy(state->mem64, p, (size_t)(b_end-p));
|
|
+ state->memsize = (uint32_t)(b_end - p);
|
|
+ }
|
|
+
|
|
+ return 0;
|
|
+}
|
|
+EXPORT_SYMBOL(xxh64_update);
|
|
+
|
|
+uint64_t xxh64_digest(const struct xxh64_state *state)
|
|
+{
|
|
+ const uint8_t *p = (const uint8_t *)state->mem64;
|
|
+ const uint8_t *const b_end = (const uint8_t *)state->mem64 +
|
|
+ state->memsize;
|
|
+ uint64_t h64;
|
|
+
|
|
+ if (state->total_len >= 32) {
|
|
+ const uint64_t v1 = state->v1;
|
|
+ const uint64_t v2 = state->v2;
|
|
+ const uint64_t v3 = state->v3;
|
|
+ const uint64_t v4 = state->v4;
|
|
+
|
|
+ h64 = xxh_rotl64(v1, 1) + xxh_rotl64(v2, 7) +
|
|
+ xxh_rotl64(v3, 12) + xxh_rotl64(v4, 18);
|
|
+ h64 = xxh64_merge_round(h64, v1);
|
|
+ h64 = xxh64_merge_round(h64, v2);
|
|
+ h64 = xxh64_merge_round(h64, v3);
|
|
+ h64 = xxh64_merge_round(h64, v4);
|
|
+ } else {
|
|
+ h64 = state->v3 + PRIME64_5;
|
|
+ }
|
|
+
|
|
+ h64 += (uint64_t)state->total_len;
|
|
+
|
|
+ while (p + 8 <= b_end) {
|
|
+ const uint64_t k1 = xxh64_round(0, get_unaligned_le64(p));
|
|
+
|
|
+ h64 ^= k1;
|
|
+ h64 = xxh_rotl64(h64, 27) * PRIME64_1 + PRIME64_4;
|
|
+ p += 8;
|
|
+ }
|
|
+
|
|
+ if (p + 4 <= b_end) {
|
|
+ h64 ^= (uint64_t)(get_unaligned_le32(p)) * PRIME64_1;
|
|
+ h64 = xxh_rotl64(h64, 23) * PRIME64_2 + PRIME64_3;
|
|
+ p += 4;
|
|
+ }
|
|
+
|
|
+ while (p < b_end) {
|
|
+ h64 ^= (*p) * PRIME64_5;
|
|
+ h64 = xxh_rotl64(h64, 11) * PRIME64_1;
|
|
+ p++;
|
|
+ }
|
|
+
|
|
+ h64 ^= h64 >> 33;
|
|
+ h64 *= PRIME64_2;
|
|
+ h64 ^= h64 >> 29;
|
|
+ h64 *= PRIME64_3;
|
|
+ h64 ^= h64 >> 32;
|
|
+
|
|
+ return h64;
|
|
+}
|
|
+EXPORT_SYMBOL(xxh64_digest);
|
|
+
|
|
+MODULE_LICENSE("Dual BSD/GPL");
|
|
+MODULE_DESCRIPTION("xxHash");
|
|
--
|
|
2.9.3
|
|
|